JP4253364B2 - Sanitary napkin - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention prevents lateral leakage of menstrual blood, cages, and the like by a barrier (gather), and even if there is a body fluid that leaks over the barrier, it is blocked by the second barrier. The present invention relates to a sanitary napkin that prevents soiling.
[0002]
[Prior art]
Conventionally, as a sanitary napkin, an absorbent body made of cotton pulp or the like is interposed between a liquid-impervious back sheet made of polyethylene sheet or polyethylene sheet laminated nonwoven fabric and a liquid-permeable top sheet made of nonwoven fabric or the like. Things are known.
[0003]
In recent years, many improvements have been made to this type of sanitary napkin, and there have been proposed ones in which side leakage is prevented by a barrier (gather) provided on the side. For example, in Japanese Patent Publication No. 7-501723, as shown in FIG. 11, there is proposed one having a side flap 51 erected by an elastic member 54 included in a side edge portion of a sanitary napkin. The elasticized side flap 51 includes a loop member 52 extending from the side edge of the absorber 55 and returning to the side edge, and an insertion member 53 formed of a layer extending from the side edge of the absorber 55. The elastic member 54 is fixed to the distal end side of the insertion member 53. According to this elastic side flap 51 (three-dimensional gather), since the tip of the standing piece comes into contact with the human body and becomes a barrier when the body fluid leaks sideways, it is possible to prevent side leakage at each stage compared to the conventional one. It has become.
[0004]
[Problems to be solved by the invention]
However, what is worn on the local part of the human body at the beginning of wearing may gradually shift in the relative position due to walking, exercise, or the like normally performed in daily life. For this reason, the napkin is wrinkled and a small gap is formed between the napkin and the human body, and the body fluid may leak from the napkin through the gap and stain shorts, pants and the like.
[0005]
At present, in this type of sanitary napkin, when a body fluid leaking over a three-dimensional gather formed on the side edge matches, no means is disclosed for further blocking this.
[0006]
Therefore, the main problem of the present invention is to prevent the side leakage of body fluid such as menstrual blood and vaginal discharge with a barrier (gather) and to block the body fluid that leaks over this barrier even if there is. It is an object of the present invention to provide a sanitary napkin that is completely prevented from soiling shorts.
[0007]
[Means for Solving the Problems]
The present invention for solving the above problems is a sanitary napkin in which an absorbent body is interposed between a liquid-permeable top sheet and a liquid-impervious back sheet, respectively, on both sides of the sanitary napkin, A first three-dimensional gather that is formed to protrude from the surface side with the position near the side edge of the absorbent body as an upright base end, and the liquid-impervious back that is formed at a relatively outer position of the first three-dimensional gather. formed to protrude to the surface side non-woven fabric that is provided substantially continuously toward the outer side from the edge of the sheet, per the mounting, mounted so as to contact the root position of the legs at the outside position of the shorts A second three-dimensional gather ,
The second three-dimensional gather is bonded to one side end of the nonwoven fabric to the outer surface of the side edge of the liquid-impervious backsheet, and is folded outward at the tip of the standing piece at the outer side, and bonded at an adjacent position, A flap portion formed by disposing a thread-like elastic body inside the bag and further extending from the joint portion at the adjacent position is made to function as a wing .
[0008]
There are various methods for forming the first three-dimensional gather and the second three-dimensional gather. First, a 1st formation aspect is equipped with the gathering nonwoven fabric by which the width direction intermediate position was adhere | attached along the longitudinal direction of the sanitary napkin in the both sides of the said sanitary napkin, The said adhesion | attachment of this nonwoven fabric for gathering The first three-dimensional gathers may be formed by the inner flap portion from the portion, and the second three-dimensional gathers may be formed by the outer flap portion from the adhesive portion of the gather forming nonwoven fabric. In the case of this first aspect, the first three-dimensional gather and the second three-dimensional gather can be formed simultaneously with a single nonwoven fabric, which is structurally excellent and has a great merit in manufacturing cost.
[0009]
Next, in a second formation mode, the first three-dimensional gather is formed by the first non-woven fabric for gather formation in which one end side is bonded to at least a position near the side edge of the absorbent body on both sides of the sanitary napkin. The second solid gathers may be formed by a second nonwoven fabric for gather formation in which one end side is bonded to the outer surface side edge of the liquid-impermeable back sheet.
[0010]
Furthermore, in the third formation mode, the first three-dimensional gathers are formed by the first nonwoven fabric for gather formation in which both ends of the sanitary napkin are bonded to one end side at least in the vicinity of the substantially side edge of the absorbent body. In addition, a side portion of the nonwoven fabric laminated so as to cover the entire outer surface of the liquid-impervious backsheet extends outward from a side edge position of the liquid-impervious backsheet, and the extension flap portion is A configuration in which a two-dimensional gather is formed can be given. According to such a configuration, the second three-dimensional gather can be efficiently formed while preventing friction between the liquid-impermeable back sheet and the shorts.
[0011]
On the other hand, in the present invention , in the second three-dimensional gather portion, the wing is integrally formed by the folded flap portion folded at the distal end of the upright piece . According to such a structure, there is no waste on the material used, and the manufacturing efficiency is excellent. In addition, the sanitary napkin is curved in a ship-like shape in the longitudinal direction by being folded back tightly at the distal end of the upright piece and by an elastic member disposed in the three-dimensional gather portion. Coupled with this, since the folded flap is provided with a crease along the curved surface, it is very easy to handle the folded flap with respect to the outer surface of the shorts.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0013]
1 is a perspective view of a sanitary napkin N according to the present invention, FIG. 2 is a view taken along the line II-II in FIG. 1, and FIG. 3 is a view taken along the line III-III in FIG.
[0014]
The sanitary napkin N (hereinafter simply referred to as napkin) includes a liquid-impervious back sheet 1 made of a polyethylene sheet, a liquid-permeable top sheet 3 that allows permeation of menstrual blood and vaginal discharge, and both of these sheets. An absorbent body 2 made of cotton-like pulp or synthetic pulp interposed between 1 and 3 and a pair of left and right first protrusions provided on the surface side with a position in the vicinity of a substantially side edge of the absorbent body 2 as a standing base end The one-dimensional gathers 4 and 4 are disposed relatively to the outside of the first three-dimensional gathers 4 and 4 and protrude to the surface side by the nonwoven fabric substantially extended from the surface of the liquid-impermeable back sheet 1. The left and right paired second solid gathers 5 and 5 are formed. In the periphery of the absorbent body 2, the outer edges of the liquid-impervious backsheet 1 and the liquid-permeable topsheet 3 are joined at the upper and lower end portions thereof by an adhesive such as hot melt or an adhesive means such as heat seal. In addition, at both side portions thereof, the liquid-impervious backsheet 1 and the upright base portion of the nonwoven fabric forming the second three-dimensional gathers 5 and 5 are bonded with an adhesive such as hot melt or a heat seal. The absorbent body 2 is held inside by being joined by means.
[0015]
Hereinafter, more specifically, the structure of the napkin N will be described in detail. As the liquid-impermeable back sheet 1, a sheet material having at least a water shielding property such as polyethylene is used. Those having a tendency to be used. As this water-impervious / breathable sheet material, for example, a microporous material obtained by forming a sheet by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, and then stretching in a uniaxial or biaxial direction. A sheet is preferably used.
[0016]
Next, a porous or non-porous nonwoven fabric or a perforated plastic sheet is suitably used as the liquid-permeable top sheet 3. The material fibers that make up the nonwoven fabric can be synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or amide, recycled fibers such as rayon or cupra, natural fibers such as cotton, and spunbond. Nonwoven fabric obtained by an appropriate processing method such as a method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace nonwoven fabric is excellent in terms of richness in flexibility and drape, and the thermal bond nonwoven fabric is excellent in terms of being bulky and soft.
[0017]
When a large number of through-holes are formed in the liquid-permeable top sheet 3, menstrual blood, venom and the like are quickly absorbed into the absorbent body 2 and have excellent dry touch properties. In this case, it is desirable to interpose a diffusion sheet having particularly excellent hydrophilicity in order to prevent the body fluid absorbed between the liquid-permeable top sheet 3 and the absorbent body 3 from returning.
[0018]
In the illustrated example, the width dimension of the liquid-permeable top sheet 3 is slightly longer than the width of the absorbent body 2 and covers only the absorbent body 2 as shown in the central sectional view of FIG. The one-dimensional gathers 4 and the second three-dimensional gathers 5 formed on the outside thereof prevent the permeation of body fluids, specifically, the gather-forming nonwoven fabric 10 different from the liquid-permeable top sheet 3, or Depending on the purpose such as enhancing the feeling of touch, it is configured using a nonwoven fabric material that has been subjected to appropriate water repellent treatment or hydrophilic treatment. As the gather forming nonwoven fabric 10, natural fibers, synthetic fibers, regenerated fibers, or the like can be used, and those formed by an appropriate processing method can be used. Preferably, in order to eliminate creaking and prevent stuffiness It is preferable to use a non-woven fabric with reduced basis weight and air permeability. Specifically, it is desirable to use a nonwoven fabric prepared with a basis weight of 18 to 23 g / m ² , and in order to surely prevent permeation of body fluids, silicon-based, paraffin metal-based, alkylchromic chloride-based water repellents A water-repellent non-woven fabric coated with the above is preferably used.
[0019]
The structure of the first and second three-dimensional gathers 4 and 5 will be described with reference to FIG. 4 which schematically shows the gather forming nonwoven fabric 10 at its intermediate position in the width direction. The napkin body is bonded to the napkin body with an adhesive such as a hot-melt adhesive at two locations, the edge A of the liquid backsheet 1 and the edge B on the liquid-permeable topsheet 3 corresponding to the side edge position of the absorber 2. The second three-dimensional gather 5 is formed by an outer flap portion 10 </ b> A that is bonded and extends outward from the edge A of the liquid-impermeable backsheet 1. That is, the front end of the outer flap portion 10A is folded back to a predetermined width, the folded end portion is bonded by hot melt or the like, and both ends or appropriate positions in the longitudinal direction are fixed inside the bag formed by the folded portion. The thread-like elastic material 7 is disposed, and the flap portion is raised on the surface side by the contraction action of the thread-like elastic body 7 to form the second three-dimensional gather 5. In this case, it is desirable that the expansion / contraction rate is 130 to 200%, particularly 130 to 160%, and the elastic strength is 50 to 200 g, particularly 60 to 100 g, so as to surely fit the base of the crotch.
[0020]
Further, the first three-dimensional gather 4 is formed by the inner flap portion 10 </ b> B extending from the edge B of the liquid-permeable top sheet 3. The inner flap portion 10B is folded almost double, and the tip of the inner flap portion 10B is bonded to the position C where the end edge portion B overlaps with an adhesive such as hot melt, and a certain width is provided inside the bag formed by the folding. A tape-like elastic member 6 is provided, and the flap portion 10B is erected by the contracting action of the tape-like elastic member 6, whereby the first three-dimensional gather 4 is formed. In this case, it is desirable that the expansion / contraction rate is 120 to 300%, particularly 130 to 160%, and the elastic strength is 10 to 45 g, particularly 15 to 30 g.
[0021]
As shown in FIG. 3, the first three-dimensional gather 4 is folded at the end of the napkin N in the longitudinal direction with a half of the height of the standing piece as a fold line, and the joining surface is hot-melted or the like Is glued by. This folded part also becomes a bulky part protruding to the surface side to prevent body fluid leaking back and forth from getting over the side part and flowing out.
[0022]
As the elastic members 6 and 7, a foam or a film such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, or the like that is usually used is used. However, in the first three-dimensional gather 4 on the inner side, while preventing leakage of menstrual blood and the like reliably, in consideration of hitting the human body, a tape-shaped one having a certain width is used, In the outer second three-dimensional gather 5, a thread-like elastic member is used with an emphasis on fit to the body. In other words, since the first three-dimensional gathers 4 and 4 are mounted so as to be pressed against the local part of the human body, the first gathers 4 and 4 are gathers (barriers) that contact with each other with a width, while the second gathers 5 and 5 In order to make the tip contact with the root part reliably, it is made to fit the movement of the body surely as a thread rather than a tape.
[0023]
When the napkin N is attached to a local part of the body, as shown in FIG. 10, the first gather 4 and the wrinkle and wrinkle are not applied when the napkin N is applied to the local part. The second gathers 5 are worn so that both are continuously in close contact with the body and no gap is formed. In this case, the second three-dimensional gathers 5 and 5 are mounted so as to come into contact with the base positions of the legs at the outer positions of the shorts S. The first three-dimensional gathers 4 and 4 block the leakage of body fluid in the shorts S to guard against side leakage, and a gap is formed between the first three-dimensional gather and the body due to lateral displacement and dripping. Even if there is a body fluid that leaks over the gathers 4 and 4, the second three-dimensional gathers 5 and 5 block the body fluid and completely prevent the shorts S from becoming dirty.
[0024]
According to the formation mode of the three-dimensional gather according to the first example, since the first three-dimensional gather 4 and the second three-dimensional gather 5 are formed by the single nonwoven fabric material 10, the cost is reduced and the parts Since the number is small, it is excellent in terms of operability.
[0025]
By the way, regarding the formation aspect of the said 1st solid gather 4 and the 2nd solid gather 5, other aspects can be considered. The example shown by FIG. 5 is an example which comprised the 1st three-dimensional gather 4 and the 2nd three-dimensional gather 5 by the nonwoven fabrics 11 and 12 for separate gather formation, respectively. Specifically, the second three-dimensional gather 5 joins the gather-forming nonwoven fabric 11 to the outer surface of the side edge of the liquid-impermeable back sheet 1 with a hot melt adhesive, and the first example at the outer end. The second three-dimensional gather 5 is formed by arranging the thread-like elastic material 7 in the same manner as described above, while the first three-dimensional gather 4 has a liquid-impervious backsheet 1 on one side end of the non-woven fabric 12 for gather formation. Adhering to the side edge inner surface E of the absorbent body 2 and adhering to the substantially side edge B of the absorbent body 2, the flap portion extending from the joint B is folded back almost double, and its tip is the end edge Adhering to the position C overlapping with B with an adhesive such as hot melt, and the like, the first three-dimensional projecting to the surface side by providing a tape-like elastic member 6 having a certain width inside the bag formed by folding. Gather 4 is formed.
[0026]
Furthermore, as shown in FIG. 6, in order to prevent friction between the liquid-impermeable back sheet 1 and the shorts S, when the outer surface side of the liquid-impermeable back sheet 1 is laminated with a nonwoven fabric, You may make it the side edge part of this laminated nonwoven fabric 13 extend outside the edge of the liquid-impermeable back sheet 1, and form the 2nd three-dimensional gather 5 by this extended flap part 13A.
[0027]
In addition, it relates to the formation aspect of the said 1st three-dimensional gather 4, In the example of FIGS. 4-6 mentioned above, the inner side sheet | seat of the two sheets which comprise an upright piece reaches the liquid-impermeable back sheet 1 continuously. Although it is set as a piece and the edge part of the outer sheet | seat is adhere | attached on the side edge upper part position of the absorber 2, this structure may be reverse. That is, as shown in FIG. 7, the end of the inner sheet may be bonded onto the surface of the liquid-permeable top sheet 3, and the outer sheet may be a continuous piece that reaches the liquid-impermeable back sheet 1.
[0028]
On the other hand, the configuration having the double three-dimensional gathers 4 and 5 can be suitably applied to the winged napkin N ′ shown in FIG. The wing W is coated with an adhesive on the back side thereof, and prevents lateral shift by wrapping around the side edge of the crotch portion of the shorts and bonding it to the outer surface of the shorts at the time of wearing. As shown, the wing W can be formed integrally with the second solid gather 5 according to the present invention. For example, one side end of the nonwoven fabric material 14 forming the second three-dimensional gather 5 is joined to the outer surface of the side edge of the liquid-impervious backsheet 1, and the outer portion thereof is folded back at the tip (distal end) of the standing piece. The adjacent position F is joined with an adhesive, and the second three-dimensional gather 5 is formed by disposing the thread-like elastic body 7 inside the bag, and the flap portion 14 further extending from the adhesive portion F is provided. It is made to function as the wing W. In addition, although the example of illustration shows the example of wing formation of the example corresponded to the gathering formation mode just shown by FIG. 5, the solid gathers 4 and 5 are formed with the one nonwoven fabric 10 shown by FIG. The wings W can be formed in the same manner as in the embodiment and the embodiment in which the second three-dimensional gather 5 is formed by the laminated nonwoven fabric 13 of the liquid-impermeable back sheet 1 shown in FIG.
[0029]
【The invention's effect】
As described above in detail, according to the present invention, a double three-dimensional gather is formed on both sides of the sanitary napkin, so that side leakage of body fluids such as menstrual blood and vaginal discharge is completely prevented. It becomes possible to prevent dirt.
[Brief description of the drawings]
FIG. 1 is a perspective view of a sanitary napkin 1 according to the present invention.
FIG. 2 is a view taken along the line II-II in FIG.
FIG. 3 is a view taken along the line III-III in FIG. 1;
FIG. 4 is a schematic view of a formation mode of a double solid gather according to the first example.
FIG. 5 is a schematic view of a formation mode of a double solid gather according to a second example.
FIG. 6 is a schematic diagram of a formation mode of a double solid gather according to a third example.
FIG. 7 is a view showing a modification of the formation mode of the second three-dimensional gather 4;
FIG. 8 is a perspective view of a napkin with a wing N ′.
FIG. 9 is a schematic diagram of a form of forming a double solid gather in which wings W are integrally formed.
FIG. 10 is a view showing a mounting example of the napkin N.
FIG. 11 is a half sectional perspective view of a napkin 50 having a conventional three-dimensional gather.
[Explanation of symbols]
N ... sanitary napkin, 1 ... liquid-impervious back sheet, 2 ... absorbent body, 3 ... liquid-permeable top sheet, 4 ... first solid gather, 5 ... second solid gather, 6 ... tape-like elastic body, 7 ... thread-like elastic body, W ... wing, 10-12 ... nonwoven fabric for gather formation, 13 ... laminated nonwoven fabric

Claims (4)

In a sanitary napkin in which an absorbent body is interposed between a liquid-permeable top sheet and a liquid-impervious back sheet, a position near a substantially side edge of the absorbent body is set up on both sides of the sanitary napkin. A first three-dimensional gather that protrudes toward the surface as an end, and is formed at a relatively outer position of the first three-dimensional gather, and is directed outward from an edge of the liquid-impermeable backsheet. And a second three-dimensional gather that is formed so as to protrude to the surface side by a nonwoven fabric provided substantially continuously, and is attached so as to come into contact with the base of the leg at the outer position of the shorts ,
The second three-dimensional gather is bonded to one side end of the nonwoven fabric to the outer surface of the side edge of the liquid-impervious backsheet, and is folded outward at the tip of the upright piece at the outer portion, and bonded at an adjacent position, A sanitary napkin characterized in that a flap portion formed by disposing a thread-like elastic body inside a bag and further extending from a joint portion at the adjacent position functions as a wing . On both sides of the sanitary napkin, a gather-forming non-woven fabric having a middle position in the width direction bonded along the longitudinal direction of the sanitary napkin is provided. The sanitary napkin according to claim 1, wherein a three-dimensional gather is formed, and the second three-dimensional gather is formed by an outer flap portion than the adhesive portion of the gather forming nonwoven fabric. In the both sides of the sanitary napkin, the first three-dimensional gather is formed by a first nonwoven fabric for gather formation in which one end side is bonded to at least a position near the side edge of the absorbent body. The sanitary napkin according to claim 1, wherein the second three-dimensional gather is formed by a second nonwoven fabric for gather formation in which one end side is bonded to an outer edge portion. On both sides of the sanitary napkin, the first three-dimensional gather is formed by a first nonwoven fabric for gather formation in which one end side is bonded at least to a position near the side edge of the absorbent body, and the liquid-impermeable back sheet The side part of the nonwoven fabric laminated so as to cover the entire outer surface of the non-permeable back sheet extends outward from the side edge position of the liquid-impermeable back sheet, and the second three-dimensional gather is formed by the extended flap part. Item 1. A sanitary napkin according to item 1.

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